problem with network in domU

problem with network in domU

[Maciej Browarski]

Hello,
I'm using xen-3.1.2 downloaded today from repository.
As dom0 I have linux-kernel 2.6.18 and Debian distro.
As domU I install OpenSolaris Nevada 75a.
My config file looks:
name = 'osdev'
memory = '1024'
vcpus = 2
disk = [ 'file:/mnt/xen/osdev/disk.raw,0,w',  
'file:/mnt/xen/osdev/disk1.raw,1,w' ]
vif = [ '' ]
on_shutdown = 'destroy'
on_reboot = 'destroy'
on_crash = 'destroy'

After xm create I see new devices in dom0: peth0, xenbr0 and etc.
bash# brctl show
xenbr0          8000.feffffffffff       no              vif0.0
                                                        peth0
                                                        vif3.0
So, on dom0 outside network works fine, but on domU I have strange 
behavior ( dom0 and domU has addresses from DHCP).
 From domU I catch good address. I can also ping outside gateway but 
connect with any TCP/UDP ports outside my machine is incorrect (there 
are only SYN and SYN/ACK nothing more and timeout).
All connection between dom0 and domU works good.
Have you any idea what's wrong ?

Regards
Maciej

Re: problem with network in domU

[michael schuster]

Maciej Browarski wrote:
> Hello,
> I'm using xen-3.1.2 downloaded today from repository.
> As dom0 I have linux-kernel 2.6.18 and Debian distro.
> As domU I install OpenSolaris Nevada 75a.
> My config file looks:
> name = 'osdev'
> memory = '1024'
> vcpus = 2
> disk = [ 'file:/mnt/xen/osdev/disk.raw,0,w',  
> 'file:/mnt/xen/osdev/disk1.raw,1,w' ]
> vif = [ '' ]
> on_shutdown = 'destroy'
> on_reboot = 'destroy'
> on_crash = 'destroy'
> 
> After xm create I see new devices in dom0: peth0, xenbr0 and etc.
> bash# brctl show
> xenbr0          8000.feffffffffff       no              vif0.0
>                                                         peth0
>                                                         vif3.0
> So, on dom0 outside network works fine, but on domU I have strange 
> behavior ( dom0 and domU has addresses from DHCP).
>  From domU I catch good address. I can also ping outside gateway but 
> connect with any TCP/UDP ports outside my machine is incorrect (there 
> are only SYN and SYN/ACK nothing more and timeout).
> All connection between dom0 and domU works good.
> Have you any idea what's wrong ?

sounds a bit like you're having difficulty with checksums.

the following is a way to disable ip checksums *in dom0*; I don't know 
whether the same works in domU, but you could give it a try:

Set "ip:dohwcksum" to 0 in /etc/system. Reboot, retest, report results.

(btw: that means you need to add a line looking like this:
	set ip:dohwcksum = 0
to /etc/system in your domU)

hth
-- 
Michael Schuster	Sun Microsystems, Inc.
recursion, n: see 'recursion'

Re: Re: [xen-discuss] problem with network in domU

[Maciej Browarski]

michael schuster wrote:
> Maciej Browarski wrote:
>> Hello,
>> I'm using xen-3.1.2 downloaded today from repository.
>> As dom0 I have linux-kernel 2.6.18 and Debian distro.
>> As domU I install OpenSolaris Nevada 75a.
>> My config file looks:
>> name = 'osdev'
>> memory = '1024'
>> vcpus = 2
>> disk = [ 'file:/mnt/xen/osdev/disk.raw,0,w',  
>> 'file:/mnt/xen/osdev/disk1.raw,1,w' ]
>> vif = [ '' ]
>> on_shutdown = 'destroy'
>> on_reboot = 'destroy'
>> on_crash = 'destroy'
>>
>> After xm create I see new devices in dom0: peth0, xenbr0 and etc.
>> bash# brctl show
>> xenbr0          8000.feffffffffff       no              vif0.0
>>                                                         peth0
>>                                                         vif3.0
>> So, on dom0 outside network works fine, but on domU I have strange 
>> behavior ( dom0 and domU has addresses from DHCP).
>>  From domU I catch good address. I can also ping outside gateway but 
>> connect with any TCP/UDP ports outside my machine is incorrect (there 
>> are only SYN and SYN/ACK nothing more and timeout).
>> All connection between dom0 and domU works good.
>> Have you any idea what's wrong ?
>
> sounds a bit like you're having difficulty with checksums.
>
> the following is a way to disable ip checksums *in dom0*; I don't know 
> whether the same works in domU, but you could give it a try:
>
> Set "ip:dohwcksum" to 0 in /etc/system. Reboot, retest, report results.
>
> (btw: that means you need to add a line looking like this:
>     set ip:dohwcksum = 0
> to /etc/system in your domU)
>
> hth
Thanks :) it's works :)

Best Regards,
Maciej